Police in southern New Jersey said three juveniles were in custody Monday after multiple school districts were targeted by online threats, prompting two school systems to cancel classes for the day.

Harrison Township police said a 15-year-old from Mullica Hill, as well as a juvenile from Woodbury and another from Glassboro, were arrested after being linked to “several social media posts referencing threats” to schools in Gloucester and Camden counties.

Philadelphia NBC affiliate WCAU reported that the threats originated from a TikTok post in which a user said five local schools were going to be “shot up.”

Officials with the Deptford Township School District and the neighboring Woodbury City Schools closed their campuses Monday in response to the online threat.

“While we do not believe the threat to be credible, we are exercising extreme caution to ensure the safety of our students, staff and families,” Woodbury City Schools Superintendent Andrew Bell said in an announcement.

Haddon Heights School District and Glassboro Public Schools opted to keep their doors open Monday with an increased police presence on school grounds.

In Florida, two teens — a 14-year-old girl in Broward County and a 13-year-old boy in Madison County — were arrested over the weekend after they were tied to social media threats against schools in their area.

The social media threats follow a deadly high school shooting last week in Georgia, where a 14-year-old boy was charged with killing two teachers and two students, and injuring nine others during an attack.

Shooting suspect Colt Gray is facing murder charges as an adult in the deadly rampage at Apalachee High School, which is roughly an hour northeast of Atlanta.

The boy’s father, 54-year-old Colin Gray, was also charged with second-degree murder, involuntary manslaughter and child cruelty in the aftermath of the mass shooting.

Parents are becoming increasingly liable for their children’s criminal conduct. 

Jennifer and James Crumbley were sentenced to 10 years behind bars this spring after their son, Ethan Crumbley, shot and killed four people during a 2021 school shooting in Michigan.

The Crumbleys were convicted of involuntary manslaughter on grounds that they failed to secure the gun their son used at Oxford High School and ignored other signs of mental distress.

• Matt Delaney can be reached at mdelaney@washingtontimes.com.